Normal stress on a straight beam that gets bending moment is shown in the figure below. In contrast to shear stress due to shear force, the magnitude of normal stress due to bending moment will has maximum value in the longest distance from neutral axis.
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| Figure 1: Normal Stress due to Bending Moment |
Normal stress due to bending moment can be calculated using the following equation:
σ = M / I
Where:
I = section of moment inertia
M = normal force
σ = normal stress due to bending moment